Liquid laundry detergents containing selected quaternary ammonium compounds

ABSTRACT

The present disclosure relates to a liquid detergent composition comprising a surfactant system which is free of linear alkyl benzene sulfonate. The detergent composition comprises a selected quaternary ammonium surfactant, and an anionic surfactant selected from the group consisting of alkyl alkoxy sulfates and alkyl sulfates.

FIELD OF THE INVENTION

The present invention relates to detergent compositions containing surfactants selected from quaternary ammonium surfactants.

More particularly, the invention is directed to detergent compositions containing a nil-LAS surfactant system comprising anionic surfactants selected from the group consisting of alkyl alkoxylated sulfates and alkyl sulfates, said composition further containing specific quaternary ammonium surfactants.

BACKGROUND OF THE INVENTION

The present invention relates to liquid detergents containing a surfactant system which is free of Linear alkyl benzene sulfonate surfactants (LAS), said liquid detergent having optimum greasy stain removal performance.

The recent trend towards partial or total replacement of Linear alkyl benzene sulfonate surfactants (LAS) has urged the detergent formulators to rebalance their formulations with different surfactants.

There is thus a standing desire for performance and flexibility reasons to make available a surfactant system capable of providing optimum detergency performance which is equivalent to that of LAS-containing detergents.

The above objective has been met by a surfactant system comprising anionic surfactants selected from the group consisting of alkyl alkoxylated sulfates and alkyl sulfates, said surfactant system further comprising a cosurfactant selected from the group of quaternary ammonium surfactants.

It has been surprisingly found that detergent compositions containing said surfactant system exhibit detergency performance equivalent to that of LAS-containing detergents.

In addition, it was found that the liquid detergent compositions containing the selected quaternary ammonium surfactants of the present invention, provide excellent greasy stain removal performance without detriment to the suds characteristics of the compositions. This finding allows to reduce the level of suds suppressing agents, thereby facilitating the formulation of concentrated liquid detergents.

Quaternary ammonium surfactants are described in the art. The properties of these surfactants are very strongly influenced by the type of substituent. Chain length, degree of saturation, branching or the presence and number of hydroxylic or ethoxy groups mainly determine the properties of the surfactant. Whereas typical textile-conditioning actions are performed by cationic surfactants with two long alkyl chains, cationic surfactants with only one long alkyl chain have been reported to improve the detergency performance in laundry detergents. EP-A-224 describes liquid built laundry detergent compositions comprising a general class of quaternary ammonium surfactants. Decyltrimethyl ammonium chloride is described. EP 8142 describes a liquid builder-free heavy duty detergent comprising a quaternary ammonium compound of a general formula. Octyldihydroxyethylmethyl ammonium halides are described.

For optimum grease detergency performance, however, these compositions of the prior art require high level of cationic surfactant. These high levels of cationic surfactants in turn, generate excessive foaming, thereby raising problems of automatic washing machine compatibility. If, on the other hand, the cationic surfactant is reduced at a level at which foam regulation is no longer a problem, the beneficial grease detergency characteristics of quaternary compounds are diminished.

In contrast, the surfactant system of the present invention provides optimum grease and oil removal performance, thereby not adversely affecting the suds characteristic of the detergent compositions formulated therewith.

In addition, it has been found that liquid detergent compositions formulated with said surfactant system are extremely useful when the liquid detergent compositions are in direct contact with the fabrics such as during pretreatment.

SUMMARY OF THE INVENTION

The present invention relates to liquid detergent compositions comprising a Nil-LAS surfactant system said surfactant system comprising anionic surfactants selected from the group of alkyl alkoxy sulfates and alkyl sulfates and selected quaternary ammonium surfactants present in specific weight ratio.

The detergent compositions preferably comprise at least 5%, more preferably from 10% to 65% and most preferably from 15% to 40% by weight of the surfactant system as described hereinabove.

DETAILED DESCRIPTION OF THE INVENTION

The surfactant system of the detergent compositions according to the present invention comprise anionic surfactants selected from the group of alkylalkoxy sulfates and alkyl sulfates.

Alkyl alkoxylated sulfates and/or alkyl sulfates

The alkyl alkoxylated sulfate surfactants hereof are water soluble salts or acids of the formula RO(A)_(m) SO3M wherein R is an unsubstituted C₁₀ -C₂₄ alkyl or hydroxyalkyl group having a C₁₀ -C₂₄ alkyl component, preferably a C₁₂ -C₁₈ alkyl or hydroxyalkyl, more preferably C₁₂ -C₁₅ alkyl or hydroxyalkyl, A is an ethoxy or propoxy unit, m is greater than zero, typically between about 0.5 and about 6, more preferably between about 0.5 and about 3, and M is H or a cation which can be, for example, a metal cation (e.g., sodium, potassium, lithium, calcium, magnesium, etc.), ammonium or substituted-ammonium cation. Alkyl ethoxylated sulfates as well as alkyl propoxylated sulfates are contemplated herein. Specific examples of substituted ammonium cations include ethanol-, triethanol-, methyl-, dimethyl, trimethyl-ammonium cations and quaternary ammonium cations such as tetramethyl-ammonium and dimethyl piperidinium cations and those derived from alkylamines such as ethylamine, diethylamine, triethylamine, mixtures thereof, and the like. Exemplary surfactants are C₁₂ -C₁₅ alkyl polyethoxylate (1.0) sulfate (C₁₂ -C₁₅ E(1.0)M), C₁₂ -C₁₅ alkyl polyethoxylate (2.25) sulfate (C₁₂ -C₁₅ E(2.25)M), C₁₂ -C₁₅ alkyl polyethoxylate (3.0) sulfate (C₁₂ -C₁₅ E(3.0)M), and C₁₂ -C₁₅ alkyl polyethoxylate (4.0) sulfate (C₁₂ -C₁₅ E(4.0)M), wherein M is conveniently selected from sodium and potassium.

The alkyl sulfate surfactants hereof are water soluble salts or acids of the formula ROSO₃ M wherein R preferably is a C₁₀ -C₂₄ hydrocarbyl, preferably an alkyl or hydroxyalkyl having a C₁₀ -C₁₈ alkyl component, more preferably a C₁₂ -C₁₅ alkyl or hydroxyalkyl, and M is H or a cation, e.g., an alkali metal cation (e.g. sodium, potassium, lithium), or ammonium or substituted ammonium (e.g. methyl-, dimethyl-, and trimethyl ammonium cations and quaternary ammonium cations such as tetramethyl-ammonium and dimethyl piperidinium cations and quaternary ammonium cations derived from alkylamines such as ethylamine, diethylamine, triethylamine, and mixtures thereof, and the like).

The quaternary ammonium compound

The quaternary ammonium surfactant according to the present invention has the formula (I): ##STR1## whereby R1 is a short chainlength alkyl (C6-C10) or alkylamidoalkyl of the formula (II) ##STR2## y is 2-4, preferably 3. whereby R2 is H or a C1-C3 alkyl, whereby x is 0-4, preferably 0-2, most preferably 0, whereby R3, R4 and R5 are either the same or different and can be either a short chain alkyl (C1-C3) or alkoxylated alkyl of the formula III,

whereby X⁻ is a counterion, preferably a halide, e.g. chloride or methylsulfate. ##STR3## R6 is C₁ -C₄ and z is 1 or 2.

Preferred quat ammonium surfactants are those as defined in formula I whereby R₁ is C₈, C₁₀ or mixtures thereof, x=o, R₃, R₄ ═CH₃ and R₅ ═CH₂ CH₂ OH.

Preferred quaternary ammonium surfactants have the general formula I, whereby the weight ratio of the quaternary ammonium surfactant to the alkyl alkoxy sulfates and alkyl sulfates is from 1:3 to 1:30, preferably from 1:3 to 1:15, most preferred from 1:5 to 1:10.

Detergent Ingredients

In another embodiment of the present invention, a liquid detergent composition is provided comprising the surfactant system of the present invention mixed with detergent ingredients. A wide range of surfactants can be used in the detergent composition of the present invention. The detergent compositions according to the present invention comprise a surfactant system which is substantially free of linear alkylbenzene sulfonate surfactant.

A typical listing of anionic, nonionic, ampholytic and zwitterionic classes, and species of these surfactants, is given in U.S. Pat. No. 3,664,961 issued to Norris on May 23, 1972.

Other suitable anionic surfactants that can be used are alkyl ester sulfonate surfactants including linear esters of C₈ -C₂₀ carboxylic acids (i.e., fatty acids) which are sulfonated with gaseous SO₃ according to "The Journal of the American Oil Chemists Society", 52 (1975), pp. 323-329. Suitable starting materials would include natural fatty substances as derived from tallow, palm oil, etc.

The preferred alkyl ester sulfonate surfactant, especially for laundry applications, comprise alkyl ester sulfonate surfactants of the structural formula:

    R.sup.3 --CH(SO.sub.3 M)--C(O)--OR.sup.4

wherein R³ is a C₈ -C₂₀ hydrocarbyl, preferably an alkyl, or combination thereof, R⁴ is a C₁ -C₆ hydrocarbyl, preferably an alkyl, or combination thereof, and M is a cation which forms a water soluble salt with the alkyl ester sulfonate. Suitable salt-forming cations include metals such as sodium, potassium, and lithium, and substituted or unsubstituted ammonium cations, such as monoethanolamine, diethanolamine, and triethanolamine. Preferably, R³ is C₁₀ -C₁₆ alkyl, and R⁴ is methyl, ethyl or isopropyl. Especially preferred are the methyl ester sulfonates wherein R³ is C₁₀ -C₁₆ alkyl.

Other anionic surfactants useful for detersive purposes can also be included in the laundry detergent compositions of the present invention. These can include salts (including, for example, sodium, potassium, ammonium, and substituted ammonium salts such as mono-, di- and triethanolamine salts) of soap, C₈ -C₂₂ primary of secondary alkanesulfonates, C₈ -C₂₄ olefinsulfonates, sulfonated polycarboxylic acids prepared by sulfonation of the pyrolyzed product of alkaline earth metal citrates, e.g., as described in British patent specification No. 1,082,179, C₈ -C₂₄ alkylpolyglycolethersulfates (containing up to 10 moles of ethylene oxide); alkyl glycerol sulfonates, fatty acyl glycerol sulfonates, fatty oleoyl glycerol sulfates, alkyl phenol ethylene oxide ether sulfates, paraffin sulfonates, alkyl phosphates, isethionates such as the acyl isethionates, N-acyl taurates, alkyl succinamates and sulfosuccinates, monoesters of sulfosuccinates (especially saturated and unsaturated C₁₂ -C₁₈ monoesters) and diesters of sulfosuccinates (especially saturated and unsaturated C₆ -C₁₂ diesters), sulfates of alkylpolysaccharides such as the sulfates of alkylpolyglucoside (the nonionic nonsulfated compounds being described below), and alkyl polyethoxy carboxylates such as those of the formula RO(CH₂ CH₂ O)_(k) --CH₂ COO--M+ wherein R is a C₈ -C₂₂ alkyl, k is an integer from 0 to 10, and M is a soluble salt-forming cation. Resin acids and hydrogenated resin acids are also suitable, such as rosin, hydrogenated rosin, and resin acids and hydrogenated resin acids present in or derived from tall oil. Further examples are described in "Surface Active Agents and Detergents" (Vol. I and II by Schwartz, Perry and Berch). A variety of such surfactants are also generally disclosed in U.S. Pat. No. 3,929,678, issued Dec. 30, 1975 to Laughlin, et al. at Column 23, line 58 through Column 29, line 23 (herein incorporated by reference).

When included therein, the laundry detergent compositions of the present invention typically comprise from about 1% to about 40%, preferably from about 5% to about 25% by weight of such anionic surfactants.

One class of nonionic surfactants useful in the present invention are condensates of ethylene oxide with a hydrophobic moiety to provide a surfactant having an average hydrophilic-lipophilic balance (HLB) in the range from 8 to 17, preferably from 9.5 to 14, more preferably from 12 to 14. The hydrophobic (lipophilic) moiety may be aliphatic or aromatic in nature and the length of the polyoxyethylene group which is condensed with any particular hydrophobic group can be readily adjusted to yield a water-soluble compound having the desired degree of balance between hydrophilic and hydrophobic elements.

Especially preferred nonionic surfactants of this type are the C₉ -C₁₅ primary alcohol ethoxylates containing 3-12 moles of ethylene oxide per mole of alcohol, particularly the C₁₂ -C₁₅ primary alcohols containing 5-8 moles of ethylene oxide per mole of alcohol.

Another class of nonionic surfactants comprises alkyl polyglucoside compounds of general formula

    RO(C.sub.n H.sub.2n O).sub.t Z.sub.x

wherein Z is a moiety derived from glucose; R is a saturated hydrophobic alkyl group that contains from 12 to 18 carbon atoms; t is from 0 to 10 and n is 2 or 3; x is from 1.3 to 4, the compounds including less than 10% unreacted fatty alcohol and less than 50% short chain alkyl polyglucosides. Compounds of this type and their use in detergent are disclosed in EP-B 0 070 077, 0 075 996 and 0 094 118.

Very suitable as nonionic surfactants are poly hydroxy fatty acid amide surfactants of the formula

    R.sup.2 --C(O)--N(R.sup.1)--Z,

wherein R¹ is H, or R¹ is C₁₋₄ hydrocarbyl, 2-hydroxy ethyl, 2-hydroxy propyl or a mixture thereof, R² is C₅₋₃₁ hydrocarbyl, and Z is a polyhydroxyhydrocarbyl having a linear hydrocarbyl chain with at least 3 hydroxyls directly connected to the chain, or an alkoxylated derivative thereof. Preferably, R¹ is methyl, R² is a straight C₁₁₋₁₅ alkyl or alkenyl chain such as coconut alkyl or mixtures thereof, and Z is derived from a reducing sugar such as glucose, fructose, maltose, lactose, in a reductive amination reaction.

Highly preferred nonionics are amine oxide surfactants. The compositions of the present invention may comprise amine oxide in accordance with the general formula I:

    R.sup.1 (EO).sub.x (PO).sub.y (BO).sub.z N(O)(CH.sub.2 R').sub.2.qH.sub.2 O(I)

In general, it can be seen that the structure (I) provides one long-chain moiety R¹ (EO)_(x) (PO)_(y) (BO)_(z) and two short chain moieties, CH₂ R'. R' is preferably selected from hydrogen, methyl and --CH₂ OH. In general R¹ is a primary or branched hydrocarbyl moiety which can be saturated or unsaturated, preferably, R¹ is a primary alkyl moiety. When x+y+z=0, R¹ is a hydrocarbyl moiety having chainlength of from about 8 to about 18. When x+y+z is different from 0, R¹ may be somewhat longer, having a chainlength in the range C₁₂ -C₂₄. The general formula also encompasses amine oxides wherein x+y+z=0, R₁ =C₈ -C₁₈, R'=H and q=0-2, preferably 2. These amine oxides are illustrated by C12-14 alkyldimethyl amine oxide,hexadecyl dimethylamine oxide, octadecylamine oxide and their hydrates, especially the dihydrates as disclosed in U.S. Pat. Nos. 5,075,501 and 5,071,594, incorporated herein by reference.

The invention also encompasses amine oxides wherein x+y+z is different from zero, specifically x+y+z is from about 1 to about 10, R¹ is a primary alkyl group containing 8 to about 24 carbons, preferably from about 12 to about 16 carbon atoms; in these embodiments y+z is preferably 0 and x is preferably from about 1 to about 6, more preferably from about 2 to about 4; EO represents ethyleneoxy; PO represents propyleneoxy; and BO represents butyleneoxy. Such amine oxides can be prepared by conventional synthetic methods, e.g., by the reaction of alkylethoxysulfates with dimethylamine followed by oxidation of the ethoxylated amine with hydrogen peroxide.

Highly preferred amine oxides herein are solids at ambient temperature, more preferably they have melting-points in the range 30° C. to 90° C. Amine oxides suitable for use herein are made commercially by a number of suppliers, including Akzo Chemie, Ethyl Corp., and Procter & Gamble. See McCutcheon's compilation and Kirk-Othmer review article for alternate amine oxide manufacturers. Preferred commercially available amine oxides are the solid, dihydrate ADMOX 16 and ADMOX 18, ADMOX 12 and especially ADMOX 14 from Ethyl Corp.

Preferred embodiments include hexadecyldimethylamine oxide dihydrate, dodecyldimethylamine oxide dehydrate, octadecyldimethylamine oxide dihydrate, hexadecyltris (ethyleneoxy)dimethyl-amine oxide, and tetradecyldimethyl-amine oxide dihydrate.

Whereas in certain of the preferred embodiments R'═H, there is some latitude with respect to having R' slightly larger than H. Specifically, the invention further encompasses embodiments wherein R'═CH₂ OH, such as hexadecylbis(2-hydroxyethyl)amine oxide, tallowbis(2-hydroxyethyl)amine oxide, stearylbis(2-hydroxyethyl)amine oxide and oleylbis(2-hydroxyethyl)amine oxide, dodecyldimethylamine oxide dihydrate.

Suitable nonionic surfactants include primary amines according to the formula R₁ R₂ R₃ N wherein R₁ and R₂ are both H, R₃ is a C₄ -C₁₈, preferably C₆ -C₁₂ alkyl chain, R₃ alkyl chains may be straight or branched and may be interrupted with up to 12 ethylene oxide moieties, most preferably interrupted with up to 5 ethylene oxide moieties. Preferred amines according to the formula herein above are n-alkyl amines. Suitable amines for use herein may be selected from 1-hexylamine, 1-octylamine, laurylamine, palmitylamine, stearylamine, oleylamine, coconutalkylamine, tallowalkyl-amine.

Other suitable primary amines include amines according to the formula R₁ R₂ R₃ N wherein R₁ and R₂ are both H; R₃ is R₄ X(CH₂)_(n), X is --O--, --C(O)NH-- or --NH--, R₄ is a C₄ -C₁₈, preferably C₆ -C₁₂ alkyl chain and R₄ may be branched or straight, n is between 1 to 5. Preferred amines according to the formula herein above 3-isopropoxypropylamine, 3-(2-methoxyethoxy)-propylamine and 2-(2-aminoethoxy)-ethanol, C₈ -C₁₀ octyl oxy propylamine, 2-ethylhexyloxypropylamine, lauryl amido propylamine and coco amido propylamine.

Suitable tertiary amines for use herein include amines tertiary amines having the formula R₁ R₂ R₃ N wherein neither R₁ nor R₂ is H, R1 and R2 are C₁ -C₈ alkylchains or ##STR4## whereby n is between 2 to 4 and x is between 1 to 6; R₃ is either a C₄ -C₁₈, preferably C₆ -C₁₂ alkyl chain, or R₃ is R₄ X(CH₂)_(n), whereby X is --O--, --C(O)NH-- or --NH--, R₄ is a C₄ -C₁₈, n is between 1 to 5, and R₅ is H or C₁ -C₂ alkyl. R₃, R₄ are preferably C₆ -C₁₂ alkyl chains and may be straight or branched ; R₃ alkyl chains may be interrupted with up to 12 ethylene oxide moieties, most preferably interrupted with up to 5 ethylene oxide moieties.

Suitable tertiary amines for use herein include coconutalkyldimethylamine, dimethyloleylamine, hexadecyltris (ethyleneoxy)dimethylamine,tallowalkylbis(2-hydroxyethyl)amine, stearoylbis(2-hydroxyethyl)amine and oleoylbis(2-hydroxyethyl)amine.

Of all of the foregoing amines the preferred materials are the trialkyl amines marketed under the tradename ADOGEN, the long chain alkyldimethyl amines marketed under the tradename ARMEEN and the ethoxylated amines marketed under the tradename ETHOMEEN. The most preferred amines for use in the compositions herein are 1-hexylamine, 1-octylamine, 1-decylamine, 1-dodecylamine. Especially desirable for odor characteristics are n-dodecyl-dimethylamine (ARMEEN DM12D) and bishydroxyethyl-coconutalkylamine (ETHOMEEN C/12, BEROL 307) and oleylamine 7 times ethoxylated (BEROL 28), lauryl amido propylamine and coco amido propylamine.

Other suitable amines include tertiary amines having the formula ##STR5## wherein R₁ is C₄ -C₁₀, preferably C₈ -C₁₀ alkyl; n is 2-4, preferably n is 3; R₂ is C₁ -C₄ or ##STR6## whereby x is 1-5, R₃ is H or C₁ -C₂ alkyl.

When included therein, the laundry detergent compositions of the present invention typically comprise nonionic surfactants in the weight ratio of anionic surfactant to nonionic surfactant from 6:1 to 1:3, preferably from 5:1 to 2:1.

When included therein, the laundry detergent compositions of the present invention typically comprise nonionic surfactants in the weight ratio of anionic surfactant to nonionic surfactant from 6:1 to 1:3, preferably from 5:1 to 2:1.

The compositions according to the present invention may further comprise a builder system. Any conventional builder system is suitable for use herein including aluminosilicate materials, silicates, polycarboxylates and fatty acids, materials such as ethylenediamine tetra-acetate, metal ion sequestrants such as aminopoly-phosphonates, particularly ethylenediamine tetramethylene phosphonic acid and diethylene triamine pentamethylene phosphonic acid. Though less preferred for obvious environmental reasons, phosphate builders can also be used herein.

Suitable polycarboxylates builders for use herein include citric acid, preferably in the form of a water-soluble salt, derivatives of succinic acid of the formula R--CH(COOH)CH2(COOH) wherein R is C10-20 alkyl or alkenyl, preferably C12-16, or wherein R can be substituted with hydroxyl, sulfo sulfoxyl or sulfone substituents. Specific examples include lauryl succinate , myristyl succinate, palmityl succinate 2-dodecenylsuccinate, 2-tetradecenyl succinate. Succinate builders are preferably used in the form of their water-soluble salts, including sodium, potassium, ammonium and alkanolammonium salts.

Other suitable polycarboxylates are oxodisuccinates and mixtures of tartrate monosuccinic and tartrate disuccinic acid such as described in U.S. Pat. No. 4,663,071.

Especially for the liquid execution herein, suitable fatty acid builders for use herein are saturated or unsaturated C10-18 fatty acids, as well as the corresponding soaps. Preferred saturated species have from 12 to 16 carbon atoms in the alkyl chain. The preferred unsaturated fatty acid is oleic acid. Other preferred builder system for liquid compositions is based on dodecenyl succinic acid and citric acid.

Detergency builders are normally included in amounts of from 3% to 50% by weight of the composition preferably from 5% to 30% and most usually from 5% to 25% by weight.

Optional detergent ingredients:

Preferred detergent compositions of the present invention may further comprise one or more enzymes which provide cleaning performance and/or fabric care benefits. Said enzymes include enzymes selected from cellulases, hemicellulases, peroxidases, proteases, gluco-amylases, amylases, lipases, cutinases, pectinases, xylanases, reductases, oxidases, phenoloxidases, lipoxygenases, ligninases, pullulanases, tannases, pentosanases, malanases, β-glucanases, arabinosidases or mixtures thereof.

A preferred combination is a detergent composition having a cocktail of conventional applicable enzymes like protease, amylase, lipase, cutinase and/or cellulase in conjunction with the lipolytic enzyme variant D96L at a level of from 50 LU to 8500 LU per liter wash solution.

The cellulases usable in the present invention include both bacterial or fungal cellulase. Preferably, they will have a pH optimum of between 5 and 9.5. Suitable cellulases are disclosed in U.S. Pat. No. 4,435,307, Barbesgoard et al, which discloses fungal cellulase produced from Humicola insolens. Suitable cellulases are also disclosed in GB-A-2.075.028; GB-A-2.095.275 and DE-OS-2.247.832.

Examples of such cellulases are cellulases produced by a strain of Humicola insolens (Humicola grisea var. thermoidea), particularly the Humicola strain DSM 1800. Other suitable cellulases are cellulases originated from Humicola insolens having a molecular weight of about 50 KDa, an isoelectric point of 5.5 and containing 415 amino acids. Especially suitable cellulases are the cellulases having color care benefits. Examples of such cellulases are cellulases described in European patent application No. 91202879.2, filed Nov. 6, 1991 (Novo).

Peroxidase enzymes are used in combination with oxygen sources, e.g. percarbonate, perborate, persulfate, hydrogen peroxide, etc. They are used for "solution bleaching", i.e. to prevent transfer of dyes or pigments removed from substrates during wash operations to other substrates in the wash solution. Peroxidase enzymes are known in the art, and include, for example, horseradish peroxidase, ligninase, and haloperoxidase such as chloro- and bromo-peroxidase. Peroxidase-containing detergent compositions are disclosed, for example, in PCT International Application WO 89/099813 and in European Patent application EP No. 91202882.6, filed on Nov. 6, 1991.

Said cellulases and/or peroxidases are normally incorporated in the detergent composition at levels from 0.0001% to 2% of active enzyme by weight of the detergent composition.

Preferred commercially available protease enzymes include those sold under the tradenames Alcalase, Savinase, Primase, Durazym, and Esperase by Novo Nordisk A/S (Denmark), those sold under the tradename Maxatase, Maxacal and Maxapem by Gist-Brocades, those sold by Genencor International, and those sold under the tradename Opticlean and Optimase by Solvay Enzymes. Also proteases described in our co-pending application U.S. Ser. No. 08/136,797 can be included in the detergent composition of the invention. Protease enzyme may be incorporated into the compositions in accordance with the invention at a level of from 0.0001% to 2% active enzyme by weight of the composition.

A preferred protease herein referred to as "Protease D" is a carbonyl hydrolase variant having an amino acid sequence not found in nature, which is derived from a precursor carbonyl hydrolase by substituting a different amino acid for the amino acid residue at a position in said carbonyl hydrolase equivalent to position +76, preferably also in combination with one or more amino acid residue positions equivalent to those selected from the group consisting of +99, +101, +103, +104, +107, +123, +27, +105, +109, +126, +128, +135, +156, +166, +195, +197, +204, +206, +210, +216, +217, +218, +222, +260, +265, and/or +274 according to the numbering of Bacillus amyloliquefaciens subtilisin, as described in the concurrently filed patent application of A. Baeck et al. entitled "Protease-Containing Cleaning Compositions" having U.S. Ser. No. 08/322,676, filed Oct. 13, 1994, which is incorporated herein by reference in its entirety.

Highly preferred enzymes that can be included in the detergent compositions of the present invention include lipases. It has been found that the cleaning performance on greasy soils is synergistically improved by using lipases. Suitable lipase enzymes include those produced by microorganisms of the Pseudomonas group, such as Pseudomonas stutzeri ATCC 19.154, as disclosed in British Patent 1,372,034. Suitable lipases include those which show a positive immunological cross-reaction with the antibody of the lipase, produced by the microorganism Pseudomonas fluorescens IAM 1057. This lipase is available from Amano Pharmaceutical Co. Ltd., Nagoya, Japan, under the trade name Lipase P "Amano," hereinafter referred to as "Amano-P". Further suitable lipases are lipases such as M1 Lipase® and Lipomax® (Gist-Brocades). Highly preferred lipases are the D96L lipolytic enzyme variant of the native lipase derived from Humicola lanuginosa as described in U.S. Ser. No. 08/341,826. Preferably the Humicola lanuginosa strain DSM 4106 is used. This enzyme is incorporated into the composition in accordance with the invention at a level of from 50 LU to 8500 LU per liter wash solution. Preferably the variant D96L is present at a level of from 100 LU to 7500 LU per liter of wash solution. More preferably at a level of from 150 LU to 5000 LU per liter of wash solution.

By D96L lipolytic enzyme variant is meant the lipase variant as described in patent application WO 92/05249 viz. wherein the native lipase ex Humicola lanuginosa aspartic acid (D) residue at position 96 is changed to Leucine (L). According to this nomenclature said substitution of aspartic acid to Leucine in position 96 is shown as: D96L.

Also suitable are cutinases [EC 3.1.1.50] which can be considered as a special kind of lipase, namely lipases which do not require interfacial activation. Addition of cutinases to detergent compositions have been described in e.g. WO-A-88/09367 (Genencor).

The lipases and/or cutinases are normally incorporated in the detergent composition at levels from 0.0001% to 2% of active enzyme by weight of the detergent composition.

Amylases (& and/or β) can be included for removal of carbohydrate-based stains. Suitable amylases are Termamyl® (Novo Nordisk), Fungamyl® and BAN® (Novo Nordisk).

The above-mentioned enzymes may be of any suitable origin, such as vegetable, animal, bacterial, fungal and yeast origin.

Said enzymes are normally incorporated in the detergent composition at levels from 0.0001% to 2% of active enzyme by weight of the detergent composition.

Other suitable detergent ingredients that can be added are enzyme oxidation scavengers which are described in Copending European Patent application 92870018.6 filed on Jan. 31, 1992. Examples of such enzyme oxidation scavengers are ethoxylated tetraethylene polyamines.

Other components used in detergent compositions may be employed, such as soil-suspending agents, soil-release polymers, abrasives, bactericides, tarnish inhibitors, coloring agents, foam control agents, corrosion inhibitors and perfumes.

Preferably, the liquid compositions according to the present invention are in "concentrated form"; in such case, the liquid detergent compositions according to the present invention will contain a lower amount of water, compared to conventional liquid detergents. The level of water is less than 50%, preferably less than 30% by weight of the detergent compositons.

Said concentrated products provide advantages to the consumer, who has a product which can be used in lower amounts and to the producer, who has lower shipping costs.

The liquid compositions are especially effective when applied directly to soils and stains in a pretreatment step.

The detergent compositions of the present invention can also be used as detergent additive products. Such additive products are intended to supplement or boost the performance of conventional detergent compositions.

The detergent compositions according to the present invention include compositions which are to be used for cleaning of substrates, such as fabrics,fibers, hard surfaces, skin etc., for example hard surface cleaning compositions(with or without abrasives), laundry detergent compositions, automatic and non-automatic dishwashing compositions.

The following examples are meant to exemplify compositions of the present inventions, but are not necessarily meant to limit the scope of the invention.

EXAMPLE I

The following liquid detergent compositions are made:

    ______________________________________                                         % by weight of the detergent compositions                                                     A      B      C        D                                        ______________________________________                                         C.sub.12 -C.sub.15 alkyl ethoxylated                                                            2        8      11     5                                      sulfate                                                                        C.sub.8 -C.sub.10 hydroxyethyl dimethyl                                                         2        2      2      1                                      quat                                                                           C.sub.12 -C.sub.14 alkyldimethyl amine                                                          --       --     --     2                                      oxide                                                                          C.sub.12 -C.sub.15 alkyl sulfate                                                                17       12     7      8                                      C.sub.12 -C.sub.14 N-methyl glucamide                                                           5        4      4      3                                      C.sub.12 -C.sub.14 fatty alcohol ethoxylate                                                     6        1      1      1                                      C.sub.12 -C.sub.18 fatty acid                                                                   11       4      4      3                                      Citric acid anhydrous                                                                           1        3      3      2                                      Diethylene triamine penta                                                                       1        1      1      0.5                                    methylene phosponic acid                                                       Monoethanolamine 8        5      5      2                                      Sodium hydroxide 1        2.5    1      1.5                                    Propanediol      14.5     13.1   10.0   8                                      Ethanol          1.8      4.7    5.4    1                                      Amylase (300 KNU/g)                                                                             0.1      0.1    0.1    0.1                                    Lipase D96/L (100 KNU/g)                                                                        0.15     0.15   0.15   0.15                                   Protease (35 g/l)                                                                               0.5      0.5    0.5    0.5)                                   Endo-A (5000 CEVU/g)                                                                            0.05     0.05   0.05   0.5                                    Carezyme (5000 CEVU/g)                                                                          0.09     0.09   0.09   0.9                                    Terephthalate-based polymer                                                                     0.5      --     0.3    0.3                                    Boric acid       2.4      2.8    2.8    2.4                                    Sodium xylene sulfonate                                                                         --       3      --     --                                     DC 3225C         0.04     0.04   0.03   0.03                                   2-butyl-octanol  1        1      1      1                                      Branched silicone                                                                               0.3      0.3    0.3    0.3                                    Water & minors    Up to 100%                                                   ______________________________________                                    

The above liquid detergent compositions (A-D) are found to be very efficient in the removal of greasy/oily soils under various usage conditions while having a controlled suds profile. 

What is claimed is:
 1. A liquid laundry detergent composition comprising a Nil-LAS surfactant system, said surfactant system comprising:(i) an anionic surfactant selected from the group consisting of an alkyl alkoxy sulfate, an alkyl sulfate and mixtures thereof; and (ii) a quaternary ammonium surfactant having the structure; ##STR7## wherein, R₁ is selected from the group consisting of C₈ alkyl, C₁₀ alkyl and an alkylamidoalkyl having the structure; ##STR8## wherein y is selected from the group consisting of 2, 3 and 4; R₂ is selected from the group consisting of H and C₁ -C₃ alkyl; x is selected from the group consisting of 0, 1, 2, 3, and 4; R₃ and R₄ are each, independently, C₁ -C₃ alkyl; and X⁻ is selected from the group consisting of halide and methylsulfate; and (iii) a nonionic amine surfactant; and wherein the weight ratio of said quaternary ammonium surfactant to said anionic surfactant is from about 1:3 to about 1:30, and the weight ratio of said anionic surfactant to said nonionic amine surfactant is from about 1:6 to about 1:3.
 2. A liquid detergent composition according to claim 1 having a quaternary ammonium surfactant as defined in claim 1 whereinR₁ is C₈, C₁₀ or mixtures thereof, x=o, R₃, R₄ ═CH₃ and R₅ ═CH₂ CH₂ OH.
 3. A liquid detergent composition according to claim 2 wherein the anionic surfactants are selected from the group consisting of alkyl ethoxylated sulfate C₁₂ -C₁₅ alkyl sulfate and mixtures thereof.
 4. A liquid detergent composition according to claim 3 further comprising a lipolytic enzyme.
 5. A liquid detergent composition according to claim 4 wherein said lipolytic enzyme is D96L lipolytic enzyme.
 6. A liquid detergent composition according to claim 5 further comprising a nonionic surfactant selected from the group consisting of alkyl polyhydroxy fatty acid, amine oxides, and mixtures thereof.
 7. A liquid detergent composition according to claim 6 wherein said amine oxide is C₁₂ -C₁₄ alkyl dimethyl amine oxide.
 8. A liquid detergent composition according to claim 7 further comprising other surfactants, builders, enzymes and other conventional detergent ingredients.
 9. A liquid detergent composition according to claim 1, wherein the weight ratio of quaternary ammonium surfactant to anionic surfactant is from about 1:3 to about 1:15.
 10. A liquid detergent composition according to claim 1, wherein the weight ratio of quaternary ammonium surfactant to anionic surfactant is from about 1:5 to about 1:10.
 11. A method of cleaning a substrate comprising treating the substrate with a composition according to claim 1, wherein the substrate is selected from the group consisting of fabrics, fibers, hard surfaces, skin and dishes.
 12. A liquid detergent composition according to claim 1, wherein said nonionic amine surfactant is selected from the group consisting of primary nonionic amine surfactants, tertiary nonionic amine surfactants and mixtures thereof. 